A Beretta 92F is used by Kuroi Kozuki when she joins up with the Professor in the middle of "Meeting, Phantom and Girl". The Professor uses one as his main sidearm when he confronts the General, who uses the same weapon, near the end of "In Bitter Lament..."
Glock 17
Glock 17 pistols are used by everyone in the Edoyama and Hotokeda-gumi as their main sidearm in the series. Kyotaro Azuma uses one in "Penguin and Girl" to wound Merayama in the leg. One was suppose to be used by Torada as his main sidearm in "Attack, ESP Girls".
M1911A1
In a flashback sequence of Azuma's childhood in "Penguin and Girl", a mobster opens fire during a hit with a M1911A1.
Submachine Guns
Heckler & Koch MP5A3
Heckler & Koch MP5A3s are used by anti-ESP operators as their main submachine gun.
Assault Rifles
AK-47
In a flashback sequence of Azuma's childhood in "Penguin and Girl", an AK-47 with a 30-round magazine was left on the ground after a shooting took place. Various factions use them as their main weapon throughout "In Bitter Lament..."
Shotguns
Franchi SPAS-12
One of the Hotokeda-gumu gurentais is armed with a Franchi SPAS-12 shotgun with the buttstock removed at the start of "The Rain, Ring, and Girl".
Sniper Rifles
Remington 700
Remington 700s are used by anti-ESP operators to fire non-lethal rounds, first seen in "Attack, ESP Girls".
Grenades
Flashbang
The General's forces uses a flashbang to stun the occupants before they were massacred in "In Bitter Lament..." It externally resembles the M7 CS gas grenade.